Use it for movies, YouTube, and casual music listening. Keep the slider in the "yellow" zone (around 200-300%) for the best balance of volume and audio fidelity. If you need to go to 500% regularly, you might want to consider investing in external Bluetooth speakers or a DAC/Amp for your headphones instead.
Letasoft Sound Booster is a sound enhancement tool that can amplify the volume of applications—like web browsers, media players, and communication software (Skype, Zoom)—by up to Letasoft.Sound.Booster.1.11. 0.514.zip
While the developer (Letasoft) releases updates periodically, build 1.11.0.514 has gained a reputation as a stable, reliable iteration. Here is what defines this version: Use it for movies, YouTube, and casual music listening